The sunn Forum

Sunn Musical Equipment => Q & A => Topic started by: shibbz on January 02, 2011, 08:53:12 am

Title: Concert Lead ohmage
Post by: shibbz on January 02, 2011, 08:53:12 am

I remember thinking the redfaced concert leads could handle 2 ohms, but I read on this forum and others that it was unlikely that concert leads could safely handle it. Was I reading about the silverfave one? This catalog page says the redface can handle 2, I was just curious if the minimum load was different between the 2 models.
http://sunn.ampage.org/site/catalogs/1979/1979catp8.jpg

Title: Re: Concert Lead ohmage
Post by: Isaac on January 02, 2011, 10:04:53 am

No, the silver face Concert series definitely cannot handle anything below 4 ohms.

Title: Re: Concert Lead ohmage
Post by: george on January 02, 2011, 11:29:08 am

It's called marketing - the red face concerts may have come with a larger power transformer  :? but the power amplifier design didn't change much compared to the black face models.

Check out the damage on this red face model - damage from driving a 2 ohm load?

http://cgi.ebay.com/SUNN-Concert-Bass-Amp-Amplifier-1976-Needs-Repair-Parts-/270680463808?pt=LH_DefaultDomain_0&hash=item3f05d019c0 (http://cgi.ebay.com/SUNN-Concert-Bass-Amp-Amplifier-1976-Needs-Repair-Parts-/270680463808?pt=LH_DefaultDomain_0&hash=item3f05d019c0)

Title: Re: Concert Lead ohmage
Post by: shibbz on January 02, 2011, 12:41:42 pm

Ew, yeah I was browsing that ad when it was still available. What section of the amp is that? pre-amp? power section? I'm no good with schematics?

Title: Re: Concert Lead ohmage
Post by: george on January 02, 2011, 10:22:41 pm

it's the power amp board.